We consider WDM networks with lightpath switching where wavelengths may be converted, as required, along the lightpath. For efficient converter usage in such a network, sparse converter placement may be followed where only some of the network nodes are equipped with wavelength converters. Given the nominal network traffic pattern, we present a simple… (More)

—In peer-to-peer networks, free riding is a major problem. Reputation management systems can be used to overcome this problem. Reputation estimation methods generally do not considers the uncertainties in the inputs. We propose a reputation estimation method using BLUE (Best Linear Unbiased estimator) estimator that consider uncertainties in the input… (More)

Target tracking in wireless sensor networks is an important area of research with applications in both the military and civilian domains. One of the most fundamental and widely used approaches to target tracking is the Kalman filter. In presence of unknown noise statistics there are difficulties in the Kalman filter yielding good results. In Kalman filter… (More)

—In peer-to-peer networks, free riding is a major problem. Reputation management systems can be used to overcome this problem. Reputation estimation methods generally do not consider the uncertainties in the inputs. We propose a reputation estimation method using BLUE (Best Linear Unbiased estimator) estimator that consider uncertainties in the input… (More)

—This paper develops both exact and approximate models for the analysis of an all-optical packet switch based on a fiber-loop buffer memory (FLBM). The switch structure and operation is based on the fully shared buffer architecture of the Research and Development in Advanced Communications in Europe—ATM Optical Switching (RACE-ATMOS) project [1], which uses… (More)

Cognitive Radio Networks (CRN) have enabled us to efficiently reuse the underutilized radio spectrum. The MAC protocol in CRN defines the spectrum usage by sharing the channels efficiently among users. In this paper we propose a novel TDMA based MAC protocol with dynamically allocated slots. Most of the MAC protocols proposed in the literature employ Common… (More)